Web-based calendar and scheduling applications for managing appointments, events, and team availability online. All available with one-click installation on 365i web hosting.
Three different products get called "online calendar software", and choosing badly here wastes more time than any other decision in this list. The first is a shared web calendar: fixtures, room bookings, an events diary that a group of people read in a browser. The second is a personal calendar server that syncs both ways with the calendar app on your phone and laptop, which is the CalDAV protocol and means Baikal, Radicale, DAViCal or Nextcloud. The third is appointment booking, where somebody picks a slot from your availability, which is Calendly (priced per seat per month, with a free tier limited to one event type), Doodle, or Google Calendar's own appointment schedules.
WebCalendar, the application in this category, is firmly the first of those three. It is a multi-user web calendar with groups, categories, resource booking, event approval before publication, iCalendar import and export, and public calendars people can subscribe to as a feed. It has been going since the early 2000s, and the assumption that it therefore died somewhere around 2013 is wrong: version 1.9.23 was released on 12 August 2026, following eight releases since February of the same year, and it requires PHP 8.2 or newer.
What it does not do is two-way sync. Your phone can subscribe to a WebCalendar feed and read it. Your phone cannot edit an event and have the change appear on the server. If that is what you need, you want a CalDAV server, and the good news is that Baikal is also PHP and also runs on ordinary hosting.
Situations we see often. If one of these sounds like you, this category is worth a look.
A league or club that wants members to see the season without creating accounts for everyone can publish a read-only calendar and hand out a subscription link. Members add it once in Apple Calendar, Outlook or Google Calendar, and every fixture change flows through automatically.
Resource calendars are the feature that separates WebCalendar from a shared Google Calendar, because a room or a minibus can be booked as a thing rather than as a person. Combined with the approval workflow, a volunteer can request a slot and a coordinator confirms it before it shows publicly.
An organisation that wants staff to see who is on leave, on site or on the road can run one internal calendar with per-group visibility. Because the install is yours, the whole thing sits behind your own login on your own domain rather than in a third-party workspace with per-user billing.
Some charities, faith groups and public bodies have a policy position or a data-residency requirement that rules out the free consumer services. A self-hosted calendar on UK hosting keeps the data where the policy says it should be, and the requirement is modest enough that our entry plan covers it.
WebCalendar solves a different problem than the CalDAV servers above, and it's worth being clear about the distinction.
It is rare for a maintainer to publish a guide steering readers to competing projects, and it is the most useful thing written about this category. Decide first whether you need a calendar people read in a browser or one that syncs to their devices. Get that wrong and no amount of configuration rescues it, because the two are different protocols doing different jobs.
Self-hosted calendars are tiny applications by modern standards. The interesting questions are reliability and timezone handling, not raw performance. We make sure the server timezone is set correctly during install, tune cron for repeating-event handling, and recommend a managed cloud server only when you cross several hundred concurrent users. Public read-only feeds work well behind the CDN, which we configure on request.
Hosting WebCalendar is undemanding: PHP 8.2 or newer, and MySQL, MariaDB, PostgreSQL or SQLite. The one thing that needs setting up beyond the installer is email reminders, which run from tools/send_reminders.php on a cron entry. Skip that and reminders never send, with no error to tell you. Our plans include unlimited cron jobs, so it is a five-minute job in the control panel.
Two things about this project are worth knowing before you commit. It has an unusual security feature for self-hosted PHP software: releases ship a cryptographically signed file manifest, and a built-in audit page checks your installed files against it and flags anything unexpected. If you have ever wondered whether an old install has been tampered with, that answers it directly. Against that, the release cadence in 2026 has been fast, and a fast-moving project is one you need to keep patched rather than install and forget.
This is the wrong choice if you want your phone to push edits back to the server, if you need free-busy scheduling across a team's real work calendars, or if you want people to book and pay for appointments. Those are CalDAV and booking-tool jobs respectively. Baikal runs happily on the same shared hosting if sync is what you are actually after.
Common questions we hear from people running online calendar software applications on 365i hosting.
One way, yes. Two way, no. WebCalendar publishes calendars as iCalendar feeds that Apple Calendar, Outlook and Google Calendar can subscribe to, so events created on the server appear on your devices. What it will not do is accept an edit made on your phone and save it back, because it is not a CalDAV server and was never designed to be. Its own maintainer says so plainly. If two-way sync is the requirement, install Baikal instead, which is also PHP and runs on the same hosting.
It is actively maintained, which surprises most people who last looked at it a decade ago. Version 1.9.23 was released on 12 August 2026 and was the eighth release that year, the project requires PHP 8.2 or newer, and recent work has included a signed-release verification system and a PHPStan-checked codebase. The old procedural code from the early versions is still in there and the maintainers say as much, but this is a live project, not a museum piece.
Baikal for most people. It is a PHP CalDAV and CardDAV server with a small admin panel, it runs on ordinary shared hosting, and it syncs two ways with iOS, Android via DAVx5, Thunderbird and Apple Calendar. Radicale is leaner but is Python and stores data as files, so it suits a server you have shell control over. Nextcloud does calendar, contacts and files together, and wants more resources than a small shared account, which puts it on a managed cloud server. We can host any of them.
Yes, and it is what WebCalendar is best at. You can expose a calendar publicly without visitors needing an account, publish it as a subscribable feed so people add it to their own calendar app, and use the approval workflow so submitted events are checked before they appear. Combined with categories and colour coding, this covers the club fixture list, the church diary and the town events calendar well. Free wildcard SSL is included on every plan, so the public calendar is served over HTTPS from day one.
They need a cron job. Reminders are sent by a script in the tools directory that has to be triggered on a schedule, and if that is not configured the calendar works perfectly while quietly never reminding anyone of anything. Set it up when you install, not after somebody misses a meeting. All our plans include unlimited cron jobs set up from a visual interface in the My365i control panel, and we can point you at the right command if you would rather ask than read the docs.
No. It books resources internally, so a room or a vehicle can be reserved and approved, but it is not an appointment-booking product and has no payment handling. If you need clients to pick a slot from your availability and pay for it, that is Calendly, Acuity, SimplyBook or a booking plugin on your website, and self-hosting will not replace them. Some organisations run both: WebCalendar for the internal and public diary, a booking tool for client-facing appointments.
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